[Elecraft] K3: Upgrade or replace

[Bob McGraw - K4TAX]

I would guess..... the matched tuner loss vs. the bypass tuner would be 
in the order of 0.1 dB or so.  At 100 watts that is about 2.5 watts 
loss.  So with the tuner bypassed, 100 watts to the feed line and with 
the matched tuner active would be about 97.5 watts to the feed line.

73 Bob, K4TAX

On 7/10/2015 9:41 PM, Bill Frantz wrote:
> 5) The KAT3A includes a relay which bypasses the tuner when using a 
> matched antenna. I have no idea how much extra power will get to the 
> antenna due to the relay, but it seems hard to imagine it will be very 
> many dB. Regardless, I'm glad that when I ordered the KAT3, they 
> shipped a KAT3A. I tend to operate QRP in contests.
>
> 73 Bill AE6JV
>
> On 7/10/15 at 12:26 PM, lists at subich.com (Joe Subich, W4TV) wrote:
>
>> I agree with Jim - for the same reasons.
>>
>> After updating the synthesizer(s) and replacing the KVX3/KXV3A
>> with the KXV3B, if one updates the KBPF3 "general coverage"
>> bandpass filter board(s) and adds the regulator bypass capacitors,
>> there are only four remaining "performance" upgrades between an
>> updated K3 and a K3S - all of which are minor:
>>
>> 1) [Modified AF output chain]*.
>> 2) 5/10/15 dB stepping on the *main receiver* attenuator (this
>> does not affect the KRX3 which remains at 0/10dB)
>> 3) improved isolation on the main RF board due to a change from
>> two to four layer construction.  The difference is probably not
>> measurable on the air.
>> 4) a change in RF output devices in the KPA3 - difference TBD.
>
> * Wayne offered corrections to Joe's statement. I believe my 
> replacement is correct.
>
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